Extended thumb safety



FIG. 1 is a side elevational view of an extended thumb safety showing my new design;

FIG. 2 is a bottom view of FIG. 1;

FIG. 3 is an opposite side elevational view of FIG. 1; and,

FIG. 4 is a left side view of FIG 1. 

The ornamental design for a extended thumb safety, as shown. 